General engineering data

A

American Gas Association Research Division

B

Biofuels Information Network

C

Cornell Environment Center

D

DOE Energy Efficiency& Renewable Energy Network

E

Economic time series
Energy Sciences Network
Environmental Protection Agency
Enviroweb

G

GRAINGER.com

H

How Stuff Works

I

INRS Canada

M

Math toolkit
Mineral Information Institute

N

National Environmental Data Index
NIST chemistry reference
Northeast Power Coordinating Council

S

Solstice - Renewable Energy Resource
Sweet's Online

U

UNEP Collaborating Centre on Energy & Environment
Utility connection

W

World Fact Book